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哈尔滨理工大学工学硕士论文
TheDevelopmentofDigitalModulation
SignalGenerator
Abstract
Intheresearchandapplicationdomainofmodemelectronicstechnology,weoften
needsignalgenerators,whichhavehighprecisionandmodulatingrfequency.Especially
withthedevelopmentofcommunicationstechnology,therearemoreandmorechannels,
whichdistributedensely,therefore,itbecomesmoreandmoreimportanttohavehigh
precisionandstabilizationcommunicationsfrequency.Butitisdifficulttogeneratethose
signalswithtraditionalmethods.Soweintroduceasignalgenerator,whichhas
modulationfunctionusingDDStechnologyinthethesis.
DirectDigitalSynthesizetechnologyisnewerarfequenciessynthesizetechnology.It
controlsphaseincrementofthesignalwithdigital厂】hismethodhasmanyadvantages,
suchashighdistinguishingratioofrfequency,switchingrfequencyrapidly,continuous
phasewhileswitching,lowphasenoise,fulldigitalandeasytointegrate.Itisadopted
widelybecauseoftheseadvantages.
BasingonthetheoreticanalysisofDDS,amethodisgiventogeneratestandard
signalsbyfrequencysynthesizemethodinthethesis,whichisbasedonphaseaccumulator.
Accordingtosystemattributes,DigitalMudulationSignalGenerator,whichhassimple
consturctionandgoodperformance,isdesigned.ThehardwareandsoftwareofDigital
MudulationSignalGeneratorarediscusseddeeply.Thehardwarecircuitsofthesystemis
designedbyadoptingTMS320F206ofCo.TIasitsMCU,andAD9852whichisachipof
DDSproducedbyCo.ADasitscore.Weuseadvancedtechnologyofelectronicdesign
automationduringthehardwaredesign.Itsimplifiesthedebugofthecircuits,reducesthe
cycleofdevelopment,raisestheperformanceandlowthecostbyusingCPLDtocarryout
logicalcontrol.NotonlycanthesignalgeneratorgenerateSinwave,FMwave,AMwave,
PMwave,butalsoitcancarryout2FSK,2ASK,2PSK.Itcangivewaveswithrfequency
upto40MHzandresolvingpowerof1/,Hz.Itsrfequencyspreadwidely.Theattributeof
thesignalgeneratorattainsadvancedlevelindomesticcorrespondingdomain.
KeywordsDirectDigitalSynthesize;D
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